I could have written that sadly.
I've just been to THE SAFE to add to my collection of Olympic 50p's and the whole lot has gone !!! The key to the safe is on my car keys and I leave them laying around.
I'm not sure which one it is but I have an 11 year old and a 15 year old, they both steal.
They both were given pocket money for chores but squandered it the same day, we spent all week nagging at them to do their chores often they didn't do it or it became a row but soon had their hand out on a Saturday morning for the pocket money
we put a stop to it and they now do the chores because they live here and that what families do, they pull together.
My ds2 school trip money was in an envelope on the fridge a couple of weeks back, that went missing. I had to replace
Mt DD's Christmas and birthday money was in an envelope that went missing she's only 4 
DP has now said no more money in the house, everything is to be bought on the card. They never steal from him only me.
I will give them money for cinema in school holidays and that's it, they are getting not a penny from me now, that was the last straw going to the safe this morning to add to my collection and the whole lot has gone 
My children are so bloody self entitled, if they want it they take it and they don't even feel guilty about it. I've often said on here that it's my fault as I didn't have it all as a child, had a poor upbringing, so I wanted my childrens childhood to be different. I've created self entitled, sometimes selfish theives who think everyone owes them a living.
I'm sorry OP but unless you have to have money in the house then don't. Only draw the minimum out that you need and buy goods on the debit card, have little or no money laying around.
They've ruined it for themselves now.